JPH0234968Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air conditioner for a vehicle, particularly to rotation control of a blower.

[Conventional technology]

Conventionally, a vehicle air conditioner includes an inside/outside air switching door 2 provided in a duct 1, a blower 3, a cooler 4, an air mix door 5, as shown in FIG.
It includes a heater 6, a mode switching door 7, a defrost outlet 8, a face outlet 9, and a foot outlet 10. The cooler 4 is the compressor 1
1, a condenser 12, a receiver tank 13, and an expansion valve 14 constitute a cooling cycle. The rotational force of an engine 15 is transmitted to the capacitor 11 via a magnetic clutch 16.

17 is an A/D converter, which detects the temperature Tr detected by the inside air sensor 18 that detects the temperature inside the vehicle, the opening degree θ of the air mix door 5 detected by the position detection potentiometer 19, and the amount of solar radiation Ts detected by the solar radiation sensor 20. , the outside air temperature Ta detected by the outside air temperature sensor 21, the duct internal temperature Tm detected by the mode sensor 22, the set temperature TD outputted from the temperature setting device 23, and the water temperature switch 50.
Converts the signal Tw outputted from each digital signal into each digital signal and outputs the digital signal to the control section 24.

The control unit 24 is composed of, for example, a microcomputer, and controls the switching circuit 25 and the actuator 2.
6, a compressor control means 29 that controls the magnetic clutch 16 via a drive circuit 28, and a blower 3 via a drive circuit 65.
A blower control means 31 for controlling the air blower and a drive circuit 6
0, air mix door control means 34 that controls the air mix door 5 via the actuator 50;
, a mode switching door control means 37 that controls the mode switching door 7 via a switching circuit 35 and an actuator 36, and each data Tr, Ts, Ta, Tm, TD.
is calculated, and each control means 27, 29, 31, 34
and arithmetic means 38 for outputting the respective outputs to 37 and 37.
39 is a manual switch for controlling the blower.

The compressor control means 29 controls the temperature inside the duct.
When Tm decreased to a temperature level (stored in the setting device 41) slightly higher than the freezing temperature of the cooler 4, the compressor 11 was turned off, and the temperature rose to a level higher than the above level by the hysteresis width (memorized in the setting device 40). The compressor 11 is sometimes turned on to keep the temperature of the cooler 4 constant.

Actuator 50 for air mix door control
As shown in FIGS. 4a and 4b, the rotational force of the motor 56 is transmitted and controlled to the air mix door 5 via the intermediate gear 57, output gear 51, and output shaft 55. Here, a movable contact 52 is provided on the output gear 51,
The contact 5 is mounted on the board 53 facing the output gear 51.
2 is provided with a fixed contact 54 in sliding contact with the output gear 51.
The speed of the blower 3 is changed by switching the input voltage of the drive circuit 65 by changing the connection relationship between the movable contact 52 and the fixed contact 54 due to the rotation of the blower (Japanese Patent Laid-Open No. 58-209609). Accordingly, the speed is switched by the speed setting means comprised of the movable contact 52 and the fixed contact 54 in the actuator 50, so that the blower control means 31 is not required separately.

[Problem that the invention attempts to solve]

However, conventional vehicle air conditioners
As disclosed in Japanese Patent Application Laid-Open No. 58-209609, that is, No. 4
As shown in Figures a and b, a sliding contact 52 interlocks with the output gear 51 of the actuator 50 that drives the air mix door, and a fixed contact 54 (common, HI,
The speed of the blower is controlled by a changeover switch as a speed setting means F consisting of LO and MID, but due to the nature of the switch, which changes in stages, the change in wind speed at the time of switching is large, which impairs comfort. There is. Note that 59 is a bearing. Therefore, the movable contact of the variable resistor is moved in conjunction with the actuator motor 51, and the blower is linearly controlled by the voltage between the movable contact and the electrodes at both ends of the resistor that the movable contact slides into contact with. However, since the movable contact slides with friction on the covering portion connected to the electrodes at both ends of the resistor, the movable contact has the disadvantage that the said portion is damaged.

[Means for solving problems]

In the present invention, the speed setting means of the blower is configured with a variable resistor, thereby allowing the speed of the blower to be varied steplessly and continuously.

[Effect]

The resistance value changes steplessly with a variable resistor,
Correspondingly, the electric power supplied to the blower is continuously controlled, so that the rotation speed of the blower can be smoothly adjusted and changed.

〔Example〕

FIG. 1 is a circuit diagram of a main part of an embodiment of a vehicle air conditioner according to the present invention. In the figure, 60 is the actuator motor 5 for driving the air mix door.
This is an actuator drive circuit that drives 6. The motor 56 has the output gear 51 and the output shaft 55 as described above.
The air mix door 5 is driven via the air mixer door 5. 62 is a movable contact that is interlocked with the operation of the actuator motor 56 and is driven by the output gear 51. 6
3 is a resistor on which this movable contact 62 slides;
A conductive electrode 63a having a constant width is inserted in the center. These movable contacts 62 and resistor 63 constitute a variable resistor as speed setting means F of the blower.
Note that the resistor 63 and the conductive electrode 63a are attached to the surface of the substrate 53. Both terminals of the resistor 63 are commonly connected to the plus side of a power source 64 whose minus side is grounded, and the conductive electrode 63a is grounded via a resistor γ1 that sets the conductive electrode 63a to a slow potential. The movable contact 62 is connected to a drive circuit 65 that controls the rotation speed of the blower via a normally open interlock switch S1 and a diode D1. The drive circuit 65 is a blower motor 66
a first transistor Tr1 connected in series with;
It consists of a second transistor Tr2 whose collector is connected to the collector of the first transistor Tr1 and whose emitter is connected to the base of the first transistor Tr1, and a resistor r2 which is connected to the base of the second transistor Tr2. In addition, 67
is a manual control section used to manually control the rotational speed of the blower, and its output voltage is supplied to the blower drive circuit 65 via a normally closed interlock switch S2 and a diode D2.

A variable resistor as the speed setting means F is specifically shown in FIG. 2a. in this case,
The resistor 63 is moved along the movement range of the movable contact 62.
A conductive electrode 63a is installed, and both ends of the resistor 63 are attached to the electrodes 72 and 73.
2 and 73 are connected to the power source 64. 74,7
Reference numeral 5 denotes a high-speed range setting electrode for setting the high-speed range of the blower, which is wider than the electrodes 72 and 73 so as to protrude toward the center. That is, the movable contact 62 of the resistor 63 is located closer to the center than the electrodes 72 and 73 at both ends in the sliding direction.

Further, a common contact 70 is provided so as to be in constant contact with the movable contact 62, and a variable voltage is taken out from this common contact 70 and sent to the switch S1.

In the above configuration, the voltage taken out from the common contact 70 changes as shown in FIG. 2b. That is, the output voltage V is
In the range where 3a contacts, a low voltage VLO is set by the resistor γ1, and the movable contact 62 leaves this conductive electrode 63a. Therefore, the movable contact 62 slides to the high potential side of the resistor 63, the output voltage V gradually increases, and the movable contact 62 slides to the high potential side of the resistor 63.
75, the output voltage V reaches its maximum value Vmax.

Therefore, the blower motor 66 is controlled according to the voltage change obtained by amplifying this voltage V by the drive circuit 65. That is, the movable contact 62
The speed is low in the range where the movable contact 62 is in contact with the conductive electrode 63a, and increases as the movable contact 62 moves away from the conductive electrode 63a. Therefore,
Since the blower is continuously controlled, the blowing of conditioned air will not be discontinuous.

In the figure a, 74 and 75 are high-speed range setting electrodes for setting the high-speed range of the blower, and electrode 7
It is wider than Nos. 2 and 73 so as to protrude toward the center. In addition, the high speed range setting electrodes 74, 7
Reference numeral 5 overlaps the electrodes 72 and 73 and is originally unnecessary electrically. However, the movable contact 62 is at the joint between the electrodes 72, 73 and the resistor 63,
That is, if the stepped portion h shown in FIG. 2c is repeatedly slid, there is a possibility that the joint portion will be worn out because it has a large wall thickness and a convex shape. Therefore, high-speed range setting electrodes 74 and 75 are provided to compensate for disconnection during wear. Figure b shows the movable contact 62.
3 is a graph showing an extension line between the movement position and the voltage V. As is clear from the figure, the maximum voltage Vmax is reached before the step h and the maximum speed is obtained, so there is no need for the movable contact 62 to slide up to the step h.

〔effect〕

As explained above, according to the present invention, the speed setting means F of the blower is constituted by a variable resistor interlocked with the actuator, so that the rotation speed of the blower can be adjusted steplessly and continuously. This allows for comfortable changes in wind speed. Also, unlike the conventional example, a complicated relay circuit is not required, and the blower drive circuit can have a simple circuit configuration.

[Brief explanation of drawings]

Fig. 1 shows the main circuit configuration of an embodiment of the vehicle air conditioner of the present invention, and Fig. 2 a, b, and c are plan views, graphs, and parts showing the specific structure of the embodiment and its operation. The side view, FIG. 3, and FIGS. 4a and 4b are a simplified configuration diagram, a sectional view, and a plan view, respectively, showing a conventional example. 62...Movable contact, 63...Resistor, 63a...
...Conductive electrode, 70...Common contact, 72, 73...
...Electrode, 74, 75...High speed range setting electrode.

Claims (1)

[Scope of utility model registration request] A drive circuit 65 that controls the rotation speed of the blower, an actuator that drives the air conditioning control element, and a speed setting means F that is driven in conjunction with the operation of the actuator and controls the drive circuit, and The means F is constituted by a variable resistor that adjusts the input voltage of the blower, and the variable resistor includes a movable contact 62 that moves in relation to the operation of the actuator for driving the air mix door, and the movable contact 6.
2 slides, and electrodes 72, 73 located below both ends of the resistor 63 in the sliding direction of the movable contact.
In a vehicle air conditioner in which a power source is connected between the center point of the resistor 63 and the variable voltage obtained from the movable contact 62 is supplied to the drive circuit 65, the voltage of the power source is applied. An air conditioner for a vehicle, characterized in that high-speed range setting electrodes 74 and 75 for maximizing input voltage are provided so as to protrude further toward the center of the resistor than the electrodes 72 and 73.